Self locking strap buckle



FIG. 1 is a top perspective view of a self locking strap buckle, showingmy new design;

FIG. 2 is a top view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a side elevational veiw thereof.

The ornamental design for self locking strap buckle, as shown and described. 